Valve-silencer



C. D. STROVIGREN.

VALVE SILENCR APPLCATION FILED JAN. 26.1921.

marked @en 25, 1921.

mmm

iff

PATENT OFFICE.

CHARLES DELBERT STROMGREN, OF LOS ANGELES, CALIFORNIA.

VALVE-sinnncnn.

Specification of Letters Patent.

Patented Oct. 25, 1921.

Application filed January 26, 1921. Serial No. 440,124.

o all whom it may concern.'

Be it known that I, CHARLES DELBERT STROMGREN, a citizen of the United States, residing at Los Angeles, county of Los Angeles, State of California, have invented a new and useful Valve-Silencer, of which the following is a specification.

My invention relates to the valve mechanism of an internal combustion engine, be ing more particularly an attachment placed upon the valve stem whereby the action of the valve is improved and the noise com mon to the valve mechanism is greatly reduced..

In the class of valves commonly known as puppet or mushroom valves, the valve stem is operated by a push'rodgralve lifter or tapper which positively operates the valve to open the same, the valve being seated through the medium of a spring. As the parts of the engine are subjected to greatly varying temperatures it is necessary to allow a clearance space between the end of the valve stem and the part which mechanically operates the valve stem to openthe valve, otherwise when the engine is hot and the parts expanded the operating device would not permit the valve to seat. The parts being metal, the striking of the push rod or tappet against the end of the valve stem gives forth a metallic click or noise which is quite objectionable.

The principal object of my invention is to provide an attachment of simple form and construction which may be placed on the end of the valve stem and will tend to largely eliminate the noise incident to the operation of such valves in common use.

A further object of my invention is to produce a device of the class described which may be attached to common forms o f valve mechanism without modifying or' remodeling the valve construction.

Other objects and advantages will appear.

from the following description and drawings.

Referring to the drawings which are for illustrative purposes only, i

Figure 1 is avertical sectional view of a` lportion of an4 internal combustion engine showing the valve mechanism with an at-r tachment mounted thereon embodying a.

form of my invention.

Fig. 2 is an enlarged side elevation of the attachment showing the same mounted on the valve stem.

Fig. 3 is a side view of the attachment before being mounted.

g1g. 4 is a-plan View of the attachment, an

Fig. 5 is a sectional 5 5, F ig. 2.

The attachment is shown mounted on the lower end of the valve stem 11 of a mushroom valve 12 of an internal combustion englne 13, such valve being yieldingly held against its seat, that is in closed position, b y means of a coiled spring 14 in the usual manner. The valve 12 is lifted from its seat by means of a push rod 15 slidably mounted in the engine casing, the lower end of the rod 15 having mounted thereon a roller 16 which engages a cam 17 properly timed to actuate the valve.

The upper end of the rod 15 is provided plan view on line with a screw 19 held in adjusted position by a lock nut 20. It is to be understood that a clearance is left between the head 21 of the screw and the lower end of the valve stem of suiiicient space to insure that when the parts are'expanded from the heat of the engine that the valve is not held open when the push rod is at the end of its downward movement, such clearance being adjusted by means of the screw 19. As, the parts become worn it is necessary to make further adjustment of the screw to compensate such wear.

The attachment generally indicated at 22 is made of flat spring steel bent into substantially an S-shaped member having an upper leaf 23, a lower leaf 24 and a middle or intermediate leaf 25, the leaves of such member when in position being substantially parallel to each other.

The upper leaf 23 is provided with a round hole through which the lower end of l the valve stem 11 extends, the end of the valve stem abutting against the upper face of the middle leaf 25, the engagement of the valve stem with the upper or. top leaf above described insuring that the attachment does not become disengaged from the valve stem. The lower or bottom leaf 24 rests upon the head 21 of the screw 19 and is provided on its upper surface with a covering of sound deadening material such as ber or leather in the form shown consisting of a sheet or layer 27 of fiber or other?.similar material, one end of which is engaged by the turned over edge 28 of the leaf 24,. the sheet being engaged near its preferably form other end by lugs or fingers 29 formed on the leaf. 24 which extend through openin s 30 formed in the sides of the sheet. ,o allow a larger bend between the middle and lower leaf of the spring and consequently provide greater resiliency'therebetween, I the middle leaf with an offset portion 82.

- The attachment before mounting assumes the shape ,shown in Fig. 3 but when in position on the valve stem the middle leaf 25 and lower leaf 24 with the sheet or strip of fiber are substantially parallel, a clearance being allowed therebetween to accommodate the expansion of the parts by heat above referred to,

Any wear of the parts and a consequent greater clearance between the valve stem and push rod is accommodated by the elastic function of the spring.

It will be understood that with the at- .'tachment in place, the upward movement of the push rod brings the face of the fiber 27 against the intermediate leaf 25 and .lifts the valve stem,the `sheet of fiber and the upper leafmeeting each other in substantif ally parallel lines. The shock of the pushrod is absorbed in the spring and the noise of contact is eliminated by the ber or other material on the lower leaf of the spring.

On account of the spring pressure of the,v

device against the push rod, such rod is held in constantengagement with the cam which intermediate leaf, anda layer of sound dead-v .ening material secured to the upper face of 4results in a movement of the rod coordinate with the face of the cam. vWithout this, the movement of the push rod is accelerated resulting in atapping noise and undue wearing of the cam face, both ends' of the push rod and end of the valve stem.

I claim as my invention:v

1. A valve stem attachment comprising a flat spring-steel member substantially S- Shaped having an upper, lower and intermediate leaf, said upper leaf having an opening therein through which the lower endv of thevalve stem extends against the the lower leaf.

2;. A valve Stem atta'chment'comprising a flat, spring-steel member substantially S- shaped having an upper, lower and inten mediate leaf, means for securing one leaf to the valve stem and means for retaining sound deadening material on another leaf.

3. A valve stem attachment arranged to coact with the valve stem actuating device, comprising a flat, spring-steel member substantially S-shaped having an upper, lower and intermediate leaf, one of the outside leaves havino' an opening therein to receive the end of the valve stem, and 'a layer of porpmetallic material on the other outside ea f.

4. A valve stem attachment arranged to coactwith the valve stem actuating device, comprising a iiat, spring-steel member substantially S-shaped having an upper7 lower and intermediate leaf, said upper leaf having an opening therein through which the valve stem extends against the intermediate leaf and a layer of sound deadening material on the lower leaf having its face substantially parallel with the intermediate leaf.

l5. A valve stem attachment arranged to coact with the valve stem actuating meanscomprising a substantially S-shapedflat spring-steel member having upper, lower and intermediate leaves, said lower .and intermediate leaves being normally spaced apart and arranged to contact with each other by operation of the valve stem actuating means, and means for securing sound deadening material on one of 'said leaves.

6. A valve stem attachment `'arranged to coact with the valve actuating means comprising a flat steel spring member bent back upon itself forming leaves, means for securingsaid member to the .valve stem with the lower leaf resting on the valve actuating means and the next leaf spaced apart from the'lower leaf substantiallyparallel thereto, and means for securing sound deadening material on one of said leaves.4

In' testimony whereof I have hereunto set my hand at'Los Angeles, California, this 18th day of January, 1921.

CHARLES DELBERT'STROMGREN. 

